南岭地形对湖南省冻雨形成与分布的敏感性研究  

Sensitivity of Nanling Topography on the Formation and Distribution of Freezing Rain in Hunan Province

作　　者：秦沛 韩永翔[1] 陆正奇 李嘉欣 刘善峰 高雅文 刘唯佳[1] QIN Pei;HAN Yongxiang;LU Zhengqi;LI Jiaxin;LIU Shanfeng;GAO Yawen;LIU Weijia(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters of Nanjing University of Information Science and Technology,Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing 210044,China;State Grid Corporation of Henan,Zhengzhou 450000,China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,中国气象局气溶胶-云-降水重点开放实验室,江苏南京210044 [2]国网河南省电力公司电力科学研究院,河南郑州450000

出　　处：《灾害学》2021年第4期188-193,共6页Journal of Catastrophology

基　　金：国家自然科学基金面上项目(41875176)。

摘　　要：湖南南岭地形对冻雨形成与分布有重要影响。利用WRF模式模拟了南岭地形对冻雨进行了敏感性试验,结果显示:静止锋是湖南冻雨形成的主要背景,WRF模拟的冻雨区域与观测吻合。山脉的降低或抬升,仅轻微地影响冻雨的空间分布和冻雨量,静止锋对冻雨的影响远较地形要大。随着山脉降低,地面0℃线北移,逆温层强度增大,不利于冻雨发生;相反,山脉抬升使冷空气更易在湖南境内堆积,冻雨区变大。冻雨发生时,在南岭北部形成背风波,导致冻雨降水带呈西南-东北的条状带分布;随着地形抬升,背风波振幅增大且锋面坡度减小,其上的云团被背风波打碎成条状。同时,抬升的地形阻挡了西南暖湿气流,背风坡水汽变少,焚风效应增强,南岭以北的冻雨范围减小。The topography of the South Ridge of Hunan has an important influence on the formation and distribution of freezing rain.The WRF model is used to simulate the topography of the South Ridge for sensitivity experiments to freezing rain.The results show:Stationary fronts are the main cause of freezing rain formation in Hunan,The WRF simulated freezing rain area matches with the observation.The lowering or uplifting of mountains only slightly affects the spatial distribution of freezing rain and the amount of freezing rain,and the influence of stationary fronts on freezing rain is much greater than that of topography.With the lowering of the mountains,the 0℃line on the ground shifts northward,and the strength of the inversion layer increases,which is not conducive to the occurrence of freezing rain.On the contrary,the uplift of the mountain range makes it easier for cold air to accumulate in Hunan,and the freezing rain area becomes larger.When freezing rain occurs,a leeward wave forms in the northern part of the Nanling,resulting in a southwest-northeast strip distribution of freezing rain precipitation bands.With the uplift of the terrain,the amplitude of the leeward wave increases and the slope of the front decreases,and the clouds on it are broken into strips by the leeward wave.At the same time,the uplifted topography blocks the southwest warm and humid airflow,the water vapor on the leeward slope becomes less,the burning wind effect is enhanced,and the range of freezing rain north of the South Ridge is reduced.

关 键 词：南岭地形 WRF模式 敏感性实验 冻雨 背风波 

分 类 号：X513[环境科学与工程—环境工程] X43